<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body style="padding: 0;margin: 0">
<div style="background-color: red;height: 20px">
    <p style="position: absolute;">parent</p>
    <p>parent</p>
    <p>parent</p>
    <p>parent</p>
    <p>parent</p>
    <p>parent</p>
    <p>parent</p>
    <p>parent</p>
    <p>parent</p>
</div>
</body>
</html>
